Each listening port can be open or closed (filtered) using a firewall. On your system by querying the network stack with commands such as ss, netstat or lsof. You can get a list of the listening ports What is Open Port #Ī listening port is a network port that an application listens on. This article describes several approaches to find out what ports are opened to the outside on your Linux system. Whether you are troubleshooting network connectivity issues or configuring a firewall, one of the first things to check is what ports are actually opened on your system.
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